Grinding-machine.



G. G. SMALL.

GRINDING MACHINE.

APPLICATION FILED MAY27, 1911.

1,068,222; Patented June 3', 1913 L- I w W/rhsssga. INVENTOR FfW. 672waflmzz 3 ka-Amrne s;

COLUMBIA PLANOGRAPH C0,, WASHINGTON. 1). c4

EUNTTEED @TATiEd PATENT @FFTQE.

CHARLES G. SMALL, OF HARTFORD, CONNECTICUT.

GRINDING-MACHINE.

To all whom, it may concern Be it known that 1, CHARLES G. SMALL, acitizen of the United States, residing at Hartford, inthe county ofHartford and State of Connecticut, have invented certain new and usefulImprovements in Grinding Machines, of which the following is aspecification.

This invention relates to grinding machines, the object of the inventionbeing to provide an efiective machine of this character which is adaptedto rapidly grind surfaces of various kinds of work.

In the drawings accompanying and forming part of the presentspecification I have represented in detail one convenient form ofembodiment of the invention which to en able those skilled in the art topractice the same will be set forth fully in the following description,while the novelty of the invention will be included in the claimssucceeding said description. From such observations it will be apparentthat I do not restrict myself to the showing made by said drawings anddescription; I may depart therefrom in several respects within the scopeof my invention included in said claims.

The machine in the organization illustrated comprises broadly anoscillatory or swinging member carrying a rotary grinding too]. As shownthe axis of rotation of the tool is in parallelism with the axis ofmotion of said oscillatory or swinging member while the plane of theworking face of said grinding tool, which is preferably in the form of asurface-grinding wheel, is transverse to the axis of rotation of saidtool or wheel, by virtue of which the tool on each stroke of the saidswinging member can be made to sweep or cover a relatively large area.

The work is generally, but not necessarily, held stationary during thegrinding operation, although I prefer to make provision for moving thework toward the active face of the grinding, abrading or reducing wheelas the grinding progresses, and I also prefer to provide means forfeeding the work transversely of the arcuate path of the tool; thislatter movement might be probably aptly considered as a cross feed. As amatter of Specification of Letters Patent.

Application filed May 27, 1911.

Patented June 3 ,1913. Serial No. 629,869.

preference the grinding tool is immovable in the direction of its axisof rotation.

Referring to said drawings: Figure 1 is a side elevation of a machineinvolving my invention. Fig. 2 is a top plan view of the same. Fig. 3 isa detail view in front elevation of a means for adjusting the mainsupport.

Like characters refer to like parts throughout the several figures ofthe drawmgs.

The different parts of the machine may be supported by any suitableframework, for example by the column 5. The machine preferably includesin its make-up an oscillatory tool-carrying member, and although thesame may differ radically as to form and mounting, it is shownconsisting of an arm 6 through a hub at the inner end of which the studshaft 7 loosely extends. The oscillatory member or arm 6 swings about avertical axis, but this is not essential. The fixed stud or pivot member7 is, therefore, shown vertically disposed.

The arm 6 is shown provided at its outer end with companion hubs eachdenoted by 8 in which the spindle 9 is disposed, said spindle beingrepresented as in parallelism or substantially so with the stud or pivot7. To the lower end of the spindle 8 is fixed a grinding member as thewheel 10 the plane of the working or active face of which is preferablyat right angles to the axis of rotation of said wheel.

I prefer to provide an auxiliary support for the tool carrying member 6,and this may differ as to character; it is shown, however, consisting ofa substantially segmental flange 11, the curved part of which isconcentric with the axis of motion of said swinging arm 6. The flange 11is removed from, or is relatively remote to, the pivot or stud 7, beinglocated in proximity to the outer end of said arm 6. The latter has apendent portion 12 which slides on or traverses the flange or auxiliarysupport 11 during the back and forth motion of said arm. To the pendentmember 12 I have shown connected the gib or plate 13. This provides aneffective construction for preventing vertical vibration or chatteringof the arm 6; in other words said arm is adequately steadied andsupported. In the present case I provide a main work support as 14 whichmay, as illustrated, consist of a knee mounted for movement on ways orguides 15 extending as shown vertically, although as will be understoodfrom the statements already made, this is not essential. I prefer asintimated to provide for the movement of the work toward and from thetool 10, but it is not necessary, although preferable that such actionbe secured by the vertical movement of the work. The main support letcarries an auxiliary support 15 which may as illustrated consist of across slide to which the work is directly rigidly connected by bolts orotherwise as common in grinding machines.

While any suitable means may be provided for operating the main support14: that shown for such purpose will now be described, and is indicatedfully in Fig. 3. Swiveled to a suitable bearing on the column 5 is afeed screw 16 which extends through a nut 17 rigidly connected with themain support or knee 1 1. Splined to the feed screw is a bevel gear 18in mesh with a similar gear 19 rigidly connected with the inner end of ashaft 20 provided with a hand wheel 21, or its equivalent by turningwhich the main support 1 1 can be raised to move the work into thegrinding zone or lowered if necessary, through the agency of theintermediate described parts. The cross slide 15 may be actuated by theusual nut and screw, the screw only being shown and being denoted by 22.By virtue of the latter adjustment I can grind a very wide area. That isto say, after the tool has swept over one part of the work I can operatethe slide 15 so as to permit the tool on a second stroke to cover anentirely different part of the work and naturally thereby increase theefficiency of the machine. After one grinding step, as it might beconsidered has been effected, the main support 14: will be elevated torepeat the grinding operation.

Loose on the stud 7 above the oscillatory arm 6 is a sectional pulley 23mounted between suitable bearings at the head of the column 5. Althoughthe pulley 23 is carried by the shaft 7 this is not essential, althoughI do prefer that said pulley or its equivalent be coaxial with theswinging member 6. To the upper end of the spindle 9 I have shownrigidly connected the driven pulley 24; connected by a belt 25 with thelower section of the pulley 23 constituting a driver for said pulley 24.Around the upper section of said pulley 23 is passed the belt 26, thetwo runs of which are bent downward around the coaxial idlers 27supported by a suitable bearing on the rear upper portion of the columnand which belt may be operated by a driving pulley as 27 on the column5.

From the foregoing explanation it will be evident that my inventioncomprehends broadly the provision of a swinging or oscillatory memberprovided with a grinding tool, the axis of rotation of which latter isparallel to the axis of motion of said swinging or oscillatory member.Said swinging or oscillatory member may be operated in any suitablemanner to cause the tool to sweep across the relatively fixed work. Forthis purpose I have shown the same equipped with a forwardlyextendinghandle 28 which may be grasped by an operator who can thus move saidoscillatory or swinging member so as to carry the tool against the workwhich is for the time being stationary or at rest.

It is believed that the operation of the apparatus will be readilyunderstood from the description al'eady given, but nevertheless I deemit desirable to briefly set forth the same. otherwise attached to thesupplemental support or cross slide 15 at which time the main support orknee 14 will be operated in the manner already described to bring theupper surface of the work into the grinding plane, the arm 6 at thistime being in such position as to hold the tool 10 out'of contact withthe work, said arm being in one of the dotted line positions shown inFig. 2. The wheel 10 will then be thrown into action if it be not inrotationbyeither shifting a belt or throwing a clutch after the usualfashion, to start the belt 26, which latter through the intermediateconnections with the tool 10 will rotate the latter. The handle 28 willthen be grasped and the arm 6 will be swung first in one direction andif necessary in the other to sweep the active face of the tool acrossthe upper surface of the work. I11 some cases the necessary reductioncan be made on a single stroke of the arm, that is from one dotted lineposi tion in Fig. 2 to the other, whereas it'may be necessary to maketwo double strokes or a complete oscillation. As a matter of fact thisaction may have to be repeated.- The arcuate dotted lines in Fig. 2 showthe range of the tool and the area covered thereby. In case the work isvery wide the cross slide 15 will be operated by the screw 22 to bringthe different areas of the work under the action of the tool.

that I claim is:

1. In a grinding machine, an oscillatory member, a grinding tool carriedby said oscillatory member and rotative about an axis parallel to theaxis of motion of said oscillatory member, and an annular flange uponthe framing of the machine to which said oscillatory member is gibbedfor sliding movement.

2. In a grinding machine, an oscillatory member, a rotary,surface-grinding -wheel supported by said oscillatory member, the

Initially work will be clamped or plane of the Working face of saidWheel be- In testimony whereof I afliX my signature ing transverse tothe axls of rotation of said in presence of two W1tnesses. Wheel andsald axls being 111 parallelism With the axis of motion of saidoscillatory CHARLES SMALL member, and means for positivelypreventlVit-nessesi ing motion of said oscillatory member in the F. E.ANDERSON,

direction of said axes. HEATH SUTHERLAND.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of I'atents, Washington, D. C.

